selectrum: add consult-lsp

- add `consult-lsp` to tools/lsp if the selectrum module is active
- add the selectrum/consult version of workspace symbol search under `SPC c j/J`
- update TODO.org

modules/completion/selectrum/TODO.org

@@ -10,3 +10,5 @@ https://github.com/minad/marginalia/issues/59
 In ivy, backspace on =/foo/bar/!= (where =!= is the cursor) leads to =/foo/!=
 In selectrum, it leads to =/foo/bar!=
 ** TODO =SPC s B=
+* PROJ Other
+** TODO bind =consult-lsp-diagnostics= to something?